ESTION 5 (Start on a new page.) Define the term isotope
(2)
Study the unknown elements A to E below
A
18x
x
D
19
10
IX Х
С
20 x
Х
21
11
Х
E
"Х
5.2.1
Which of the elements above are isotopes of each other?
(1
(1
5.2.2 Write down the name of this isotope. (Allom the
Calculate the relative atomic mass of copper by using the following isotopes
of copper
Copper isotopes: 63 Cu - 69% and 65Cu - 31%
ah
below
Write only the answer next to the questio​

Asolution of sodium hydroxide was titrated against a solution of sulfuric acid. how many moles of sodium hydroxide would react with 1 mole of sulfuric acid?

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.

Fossil fuels are organic compounds that are made from